fix issue in ComboBox.js with non returned promise that now causes errors with delite 0.6.x (but was erroprone in 0.5.x)
fix issue in ComboBox.js with non returned promise that now
causes errors with delite 0.6.x (but was erroprone in 0.5.x)

harbalk/deliteful,kitsonk/deliteful,brunano21/deliteful,kitsonk/deliteful,tkrugg/deliteful,EAlexRojas/deliteful,cjolif/deliteful,harbalk/deliteful,tkrugg/deliteful,EAlexRojas/deliteful,brunano21/deliteful,cjolif/deliteful